Wood-forming machine.



J. L. ARGENBRIGHT.

WOOD FORMING MACHINE.

APPLICATION FILED OCT. 22. m4.

Patented Apr. 11, "1916.

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an unmn W 7,6 565. o aeiil'a i y my. Wm M W tint s'r'r JOHN L. ARGENIBRIGrI-IT, OF CHICAGO, ILLINOIS, ASSIGINOR 0 F ONE-HALF T0 JOHN W.

JOHNSON, OF CHICAGO, ILLINOIS.

' WOOD-FORMING MACHINE.

masses.

Specification of Letters Patent. Patented; Apr. 11, 1916.

Application filed October 22, 1914. Serial No. 867,934.

for performing what is known as inside cutting. In the specific modification of the invention herein disclosed, I have illustrated pattern forms and blanksfor rnaking toilet seats, but it is to be understood that the invention is by no means limited to practice in connection with this class of work, but may be carried out in connection with mirror frames, picture frames and in fact any kind of wood forming in which inside cut ting or cutting involving similar problems is involved.

Machines for making toilet seats and analogous articles, as hitherto made, usually comprise a table, upwardly through which extends a rotary cutter shaft carrying a rotary cutter thereon which comprises wing cutter blades.

The blank for the finished article is usually cut out at its'ce'nter'by'a jig-saw to nearly the size required and then placed upon a pattern block. The-pattern block with the cut-out blank upon it is then placed over the cutter shaft. Thereafter the blank is fed to the cutter until the edge of the pattern block impinges against the cutter shaft then the block with the blank upon it is moved around the cutter shaft in such a fashion as to rub the entire edge of the pattern form in the pattern block against the cutter shaft, which results in the knives cutting away the sawed edge on the blank and finishing it. The operation of such a machine as hitherto positioned is extremely dangerous for two reasons. In the first place, unless the knives are at rest when the pattern block and blank are placed over them, the lower edge of the block or the blank is apt to strike the rapidly rotating knives. A variety of injuries may result. The block may be knocked out of the workmans hands, split or otherwise injured, the knives may be broken, or, worst of all, one of the workmans hands may be jerked into the knives, etc. This danger, however, can be avoided and is, .avoided by all careful workmen by never attempting to place a blank upon the knives without first stopping the 'machine. This practice necessitates stopping and restarting the machine for every blank to be out. An even more serious danger, however, and one which it is imposslble by any means or pract ce heretofore known to prevent, is that which is technically known as a back out. This occurs-as the knives are being fed intothe work. At such a time the knives havewood behind them as'well as in front of them. If

there is the slightest slip back in the manipulation of the blank, that is to say if the blank 'is not fed forward evenly, atevery instant in its feed to the knives, and if the blank is allowed to drawback a very small,

ruined and often, when a back out occurs,

the knives are broken. 1 These damages, however, are lnsignificant compared 'to the obvious danger to theworkman. The sudden blow upon the work in his hands may of itself strain'his wrist or break his fingers,

etc., or if the work flies entirely off the ma 5 chine, as it sometimes does, it may strike him or a flying part of a broken knife may strike him; The most frequent accident, however, is that the pattern block and blank, breaking out of control, suddenly jerks one of his hands into theknives.

It is an object of this invention to provide a wood forming machine wherein the work may be supplied to the machine without stopping the latter.

It is another object of this invention to provide a guide to guide the frame as it is V lowered over the knives in such a fashion that it is impossible for the work to pre maturely strike the knives;

It is another ob'ect of this'invention to provide means whereby a back out will be absolutely prevented and 1 whereby the l knives must of necessity be fed regularly which overlaps the vertical aperture in the forward into the work at the beginning of table 1 to a small extent. The construct on it the out therein. is such that the guide pin 22 may be in- Z Other objects and advantages of the insorted through its aperture in the table 1 vention will appear as the description to when the flattened face 24 1S opposite the f ll Pr ceed edge of the plate 25. If the guide p n 1S In the drawings: Figure 1 is a plan view then turned it Wlll be locked into the taole of a machine constructed in accordance with by the engagement of the plate 25 with the my invention. Fig. 2 is a sectional eleva annular groove 22'. It can be remoyed by i th f On th li 2 2 f Fig 1, turning it again until the flattened face Fig. 3 is an elevation showing the machine 00 1168 1 1 051 th P 2 n in a different position. Fig. i is a per- The frame 111s provided at the base or spective View of a portion of the guide pin. its handle 12 \Vltl1 ll1 aperture 2 which Fig. 5 is a detail bottom plan view of the 0f P 9 1t 091111311563 Sill} guide p lo king evice. Fig. 6 is a rear stantially semi-circular recess 28 opening at end elevation of a portion of the machine. right angles to the direction of the han i i in the drawings 1 represents the machine which recess is in open communication with table through which projects upwardly the an 8 1 fact it Cgnfillllldflloll Of the pattern cutter shaft 2 having thereon the cutter icl'lnc slde 29 or the recess.

2o knives 3 which are situated at some distance II1 OPBMUOH and assumlng t h 11511119 above the machine table 1. At its rear and 11 has been g' Off Q Q the P opposite the cutter shaft 2, the table is pro- Shaft it blank 1S lntroduced 1 f; id ith a b 4 h i 11 m a k the frame 11. The frame 11 is then raised way 5 in which is mounted the slide 6 upon y me ns Of a h ndle 12 and moved o a hi h i i t d th l t 7 b means f positionsuch as that'shown 1n F 1g. 3, wherethe vertical bolt 8. To the plate '7 1s upon it 1s lowered until the notch 28 engages iingedly connected the arm 9, for pivotal the upper end of the pin 22, the length or movement in a vertical plane. At its fort e pin being sufhcient so that this engageward end the arm 9 is secured by screws lnent may take place before the pattern so .10 to'a frame 11 having at its forward end block is lowered sufficiently far to strike the a the handle 12. In the frame 11 may be reknives. With the notch 28 and pin 22 in l movably mounted the pattern block 13 ha vengagement, the frame is centered so that if ing cut therein a pattern form it. The lowered with the pin 22 and notch 28 con I frame 11 carries brackets 15, which by tinually in engagement, the pattern block .2 means of screws 16 and 17 secure the patand the out out blank are centered so that 1 tern block in place. The brackets 15 are neither can possibly strike the knives 3. It turned over at their upper ends 18 as shown is obvious therefore that all the operator and are provided with screw threaded aperhas to do 1s to swing the frame to such a tures to receive the bolts 19 by which the position that the pin 22 engages the notch blanks 20 are firmly held upon the pattern 28 and then drop the frame, meanwhile keep bl ck ing a slight pressure to the right on the han- From the description so far, it will be apdle 12 to keep the pin and notch in engageparent that the frame 11 controlled through ment. By this means it is possible to put handle 12 may be raised and lowered upon new work upon the knives without stopping .45 the hinge 9, may be swung laterally upon the machine, a result which could hitherto the bolt 8 or may be drawn backward and only be obtained at considerable danger to forward in the key-way 5 and that the inthe operator and only with the most careful side ed e of the pattern form 1-1 may be manipulation. Having lowered the frame to trailed around the shaft 2 to cut out the the position illustrated in F 2, the oper- 5@ blank 20 to the form of the pattern form 11 ator next begins to out. With the work in by means of the knives 3 in a fashion the position illustrated in Fig. 2 it is obvious analogous to the old manual operation. that it will be impossible for him to move the l I will now describe the guiding means frame 11 in any direction except that which forming an important part of my invention. will bring the pin 22 out of notch 28. He The table 1 is provided. directly in front thus simply pushes the handle 12 to the left, of the cutter shaft 2 with a small vertical whereupon notch 28 is moved away from the opening into which may be introduced the pin 22 and the pattern formed edge 29 is turned down end 21 of a guide pin 22. the trailed continuously across the pin. This 2 guide pin when thus introduced resting operation results in moving the frame so 69 with its shoulder 28 against the top surface that the knives will feed gradually and reguof the table 1. The lower turned down porlarly forward into the wood. It is to be partion 21 of the guide pin is provided with an ticularly noted that a back cut is rendered annular groove 22 and with a flattened absolutely impossible because the knives can face 2st, as shown in Fig. 4. Upon the botnever get behind the position in which they 6 tom of the table 1 is mounted a plate 25 started. If the operator does allow the a 1: was a! 1.4%..

frame to swing back after once startingit, the pin 22 will simply go back along the path it has taken until it strikes the notch 28, and the frame can never getto a position such that the knives can strike untouched wood in the rear of their out. As soon as the frame has been moved until a point at 30 (or thereabout) on the pattern formed edge 29 rests against the pin, the pattern form lL has come up against the cutter shaft 2. At this point the pin 28 can be removed and the cut finished by trailing the pattern form 14 around the cutter shaft 2, the operator manipulating the frame by means of the handle 12. It is impossible to accidentally get a back out from this time on. Back cuts only occur as the work is beginning. The center of the blank is all cut out before the forming operation is started. When the pin 22 has reached the point 30 or thereabout, the

edge of the wood will be completely "removed as far as the knives can reach for a long distance behind the knives and'a slight slip back could not, by any possibility, result in a back cut.

I claim 1. Inapparatus of the class described, a table, a rotary cutter having knives projecting vertically above the table, a frame movable toward. and away from the knives for holding the work, a removable guide pin adjacent the cutter and projecting farther above the table than saidknives, said pin being adapted to come into contact with the frame prior to the contact of the work with the knives.

2. The combination of a work engaging surface and a rotary cutter projecting axially therefrom, of a work support movable over said surface and also toward and from the same, a projection from said surface engaging the work support to control its movement parallel to said surface, and extended to engage the work support in its movement toward saidsurface before the work comes into the range of the cutter, so that guiding contact between the work sup port and said projection may be established before the operation of cutting begins.

In apparatus of the class described, a table, a cutter mounted in the table, a frame for holding the work slidably and pivotally connected with said table and having a pattern form therein, means for guiding said frame independently of said pattern form at the beginning of the cut, a portion of said means being removable whereby the remainder of the cut may be made from said pattern form.

l. In apparatus of the class described, a table, a cutter mounted in said table, a frame pivotally and slidably mounted on said table and having a pattern form thereon, said frame being adapted to hold the work, and means to guid the frame at the beginning of the out, said means preventing a back cut, a portion of said means being removable whereby the remainder of the cut may be finished from the pattern form in the frame independently of said means.

5. In a wood forming machine, a table, a rotary cutter projecting above the table, a frame movably connected to the table and having an aperturetherein having a pattern formed side and a recess in communication therewith, a guide pinmounted in the table and adapted to engage with the aperture and recess in the frame prior to the time the wood comes in contact with the knives, whereby the work may be placed in correct starting position in relation to the knives without striking the latter and must thereafter be correctly brought up thereto.

6. In a wood forming machine for inside cutting, a table, a rotary cutter, a frame slidably and pivotally connected to the table and provided with a handle having a pattern form therein and a guide block whereby the work may be seated upon the guide block in the frame while the latter is moved away from the cutter and the frame then raised swung back and lowered to bring the work to the knives, means cooperating with i said pattern form to temporarily and positively maintain the work out of contactwith the knives while the frame is being lowered to bring the work to the knives.

7. In a wood forming machine for inside cutting, a machine table, a rotary cutter projecting therethrough and having knives, a frame hinged to the table for vertical move-' ment with respect thereto and also pivotally connected with the table to permit lateral movement with respect thereto and having a handle, a pattern block mounted in the frame and provided with a pattern form, means forremovably securing a blank to the pattern blockand a guide pin projecting upward from the table and adapted to enter an opening in the frame, whereby the frame may be raised away from the cutter, shifted to one side and a blank then introduced upon the pattern block, the frame thereafter raised and shifted back until the guide pin registers with the opening therein and thereupon lowered whereby the cutter cannot strike the work as the latter is lowered around it.

8. In a wood forming machine for inside therein to receive the guide pin whereby when said guide pin engages said recess while the frame is above the knives, the frame may be lowered without striking the knives against the pattern block or the blank.

9. In apparatus of the class described, a machine table, a cutter shaft having a rotary cutter thereon projecting through the table, a frame mounted to swing horizontally with respect to the table to slide back and forth with respect to the cutter shaft and to be raised and lowered with respect to the table and adapted to carry an apertured blank, an aperture in the frame having a notch therein, said notch being in direct communication with a side of the aperture which is cut in a predetermined curve, whereby said frame may be raised above the knives, swung off to one side, the b a mounted thereon, then swung back un ,l the notch registers with the guide gin, lowered to bring the cutter up within the apertured blank and thereafter moved so that the curved side of the aperture travels along the said guide pin whereby the knives will be fed gradually into the work and steadily forward.

10. In a wood forming machine for inside cutting, a machine table, a cutter shaft projecting therethrough and cutter knives thereon, a frame pivotally, slidably and hingedly connected to the table and adapted to removably hold a blank thereon, said frame havin an aperture therein provided with a notch, a guide pin projecting up- 'wardly from the table and extending farther than the rotary cutting knives whereby when the notch in the aperture in the frame is in engagement with the guide pin and the frame is lowered upon the table, said frame can be moved only in a direction to bring the guide pin out of the notch and the work can thus be fed in one direction only at the beginning of the cut.

11. In apparatus of the class described, a machine table, a cutter shaft projecting therethrough having cutting knives thereon, said knives being spaced from the table, a frame pivotally, slidably and hingedly connected with the table, a pattern block mounted in the frame, means on the frame for removably securing a blank upon the pattern block, an aperture through the frame having a curved side terminating with and in communication with a recess, a guide pin projecting upwardly from the table above the cutting knives, said recess being so located when the frame is lowered with the recess in engagement with the guide pin, the blank will be lowered about the knives without striking the latter and whereby the frame can thereafter be moved with respect to the knives only in a direction to bring the guide pin out of the recess and cause the curved side of the aperture to slide past the guide pin whereby the knives can only be fed forwardly into the work and a back out is prevented.

12. In apparatus of the class described, a table, a rotary cutter projecting there through, a frame hingedly connected with the table and having an aperture therein, a guide pin projecting above the table farther than the cutter, means for attaching an apertured blank to the frame, all. so con structed and arranged that when the top of the guide pin is in engagement ith a aperture in the frame the blank will is above the cutter.

13. In apparatus of the class described, a table, a cutter shaft projecting upwardly therethrough, a-frame movably connected with said table and adapted to hold the blank, and means whereby the frame is guided at the beginning of the cut so that the knives must be fed regularly and steadily forward into the wood and contact of said knives with the wood behind them during the beginning of the cut is prevented and other means for guiding the work during the remainder of the out.

In witness whereof, I hereunto subscribe my name to this specification in the presence of two witnesses.

JOHN L. AQGENBRIGI-Itl.

W itnesses:

R. N. Dnnoknn, L. F. FABBRI.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G. 

